摘要:
Disclosed herein is a semiconductor optical waveguide-integrated light-receiving device comprising a waveguide-type photodetector and a passive optical waveguide which are selectively formed on the same substrate, wherein the width of mask for a selective growth is varied along the waveguiding direction so as to simultaneously form core layers which differ from each other in absorption edge wavelength. The core layer may be formed with an MQW layer. It is also featured that waveguide width of the photodetector is made larger than the waveguide width of the optical waveguide. The photodetector and the optical waveguide may be buried by an n--InP layer.
摘要:
Described is a semiconductor optical sensor comprising an amorphous carbon layer (2) and a transparent electrode (3) on one side of a semiconductor substrate (1) and an ohmic electrode (5) on the other side of the semiconductor substrate (1) wherein a rectifying junction is formed between said carbon layer and said semiconductor substrate. The carbon layer having a relatively high resistivity substantially suppresses a leakage current otherwise occurring under reverse bias, and at the same time serves as a protective layer. A preferred method of forming the amorphous carbon layer (2) on the semiconductor substrate (1) is by decomposition of ethyl alcohol in a DC plasma CVD process.
摘要:
A semiconductor photodetector device includes a reversed conductivity type region (45) extending through a window layer (44) to a light absorbing layer (43), and a short carrier lifetime region (60) formed to surround the reversed conductivity type region such that the lifetime of minority carriers generated in a portion of the light absorbing layer outside a depletion layer (51), which is formed around the reversed conductivity type region, is significantly shorter than the lifetime of minority carriers within the light absorbing layer near the bottom of the depletion region. The photodetector device can respond quickly to variations in incident light to generate photocurrent, due to the reduction of response speed reduction which would be caused by carriers generated in the portion of the light absorbing layer outside the depletion layer.
摘要:
The device here disclosed comprises an optical amplifier (12) coupled to direct optical energy into a passive wavegulde (16,14,21) for transmission through the waveguide to its other end. A photodetector (8) positioned relative to the passive waveguide, detects the presence of optical energy in the passive waveguide. The photodetector in the structure illustrated is positioned downstream from the optical amplifier and spatially positioned with respect to the optical amplifier to receive optical energy only from the waveguide. The photodetector does not receive optical energy directly from the optical amplifier. A small fraction of the optical energy carried by the passive waveguide is received and detected by the photodetector.
摘要:
Ein Infrarot-Halbleiter-Detektor mit einem ladungstrennenden pn-Übergang soll mit geringem Aufwand und mit geringen Kosten hergestellt werden können. Der ladungstrennende pn-Übergang ist näher an der dem Lichteinfall abgewandten Seite des Detektors als an der dem Lichteinfall zugewandten Seite des Detektors angeordnet.